What We Build

House Extensions, Loft Conversions
& Building Services across Wirral & Chester.

CNR Construction delivers house extensions, kitchen extensions, loft conversions, structural work and new builds across Wirral and Chester. Every project — regardless of size — is managed entirely in-house by our own team. No subcontractors. No hidden costs. No hand-offs to people you've never met.

Fixed price agreed upfront — the number in your quote is the number you pay
In-house team only — every trade on your project is CNR staff
Building regs sign-off included — we handle the full process with the local authority
5.0 Google rating — 23 verified reviews from Wirral homeowners
Free site visit — we assess your property and advise before you commit to anything
Service 01
01

House Extensions Wirral

A house extension is the most impactful way to add space and value to your Wirral home — without the upheaval and cost of moving. CNR Construction builds rear extensions, side extensions, wrap-around extensions and double-storey extensions across Wirral, Merseyside and Chester. Every extension is designed around your property and your brief, delivered by one in-house team on a single fixed price.

House extension Wirral — red brick UK home with bifold doors and block paved patio
Rear house extension Wirral — pitched tiled roof with French doors and sandstone paving
Completed rear extension Wirral — bifold doors opening to landscaped garden

Rear Extensions Wirral

The most popular type of house extension across Wirral. A single-storey rear extension typically transforms your ground floor — creating an open-plan kitchen-diner, a large family room, or a garden-facing living space with bifold doors. CNR builds rear extensions from groundworks through to kitchen fit-out, fully managing building regulations, structural steelwork and all trades in-house. Most single-storey rear extensions in Wirral fall under Permitted Development, meaning no planning application is required.

Side Return Extensions

Side return extensions fill in the gap between your home and the boundary wall — particularly common on Victorian and Edwardian terraces across Wirral. Often combined with a rear extension, a side return can dramatically increase the width of your kitchen or ground-floor living space. CNR manages the full project including any party wall agreements, structural calculations and building regulations sign-off.

Wrap-Around Extensions

A wrap-around extension combines a rear extension with a side return — creating an L-shaped addition to the back and side of your home. This is one of the most transformative extension types available for Wirral homes, adding maximum floor space in a single project. CNR has delivered multiple wrap-around extensions across Wirral and Chester, all on fixed-price contracts with in-house delivery.

Double-Storey Extensions

A double-storey rear or side extension adds ground-floor living space and first-floor bedroom or bathroom space simultaneously — making it one of the most cost-effective ways to significantly expand your Wirral home. Double-storey extensions almost always require planning permission. CNR advises on the planning route and can manage applications as part of the project.

All extension types
Planning advice included
Structural steel in-house
Bifold & sliding doors
Roof skylights & glazing
Kitchen fit-out available
Flooring & decorating
Building regs sign-off
Fixed price — always
Get a Free Quote See Extension Projects
Service 02
02

Kitchen Extensions Wirral

A kitchen extension is the single most popular home improvement project across Wirral — and the one that has the greatest impact on how a family lives day-to-day. CNR Construction builds kitchen extensions from the first foundation pour to the final kitchen fit-out, handling every trade in-house. We specialise in open-plan kitchen extensions that connect your home to the garden through full-width bifold doors, filled with natural light from roof skylights above.

Kitchen extension Wirral — completed interior with skylights, French doors to garden
Open-plan kitchen extension Wirral — roof skylights and full-width sliding doors
Kitchen extension Wirral — open-plan kitchen island with herringbone oak flooring

Open-Plan Kitchen Extensions

The majority of kitchen extensions in Wirral aim to create a single, flowing open-plan space — kitchen, dining and living all connected. CNR designs and builds these layouts to maximise natural light, garden connection and usable space. We handle the structural knock-throughs required, install the steel beams and deliver a space that feels entirely different from what was there before.

Kitchen Extensions with Bifold Doors

Full-width bifold doors are the defining feature of most Wirral kitchen extensions CNR builds. We supply and install thermally broken, slim-profile bifold glazing units that fold completely back — removing the boundary between your kitchen and the garden entirely. Bifold doors are specified, supplied and installed by CNR as part of your single fixed-price contract.

Kitchen Extensions with Roof Skylights

Flat-roof kitchen extensions without skylights can feel dark. CNR installs structural roof skylights as standard on flat-roof extensions — typically two or three depending on the size of the extension — flooding the interior with natural light from above. Our skylights are thermally efficient, fully weatherproofed and included in the fixed price.

Full Kitchen Fit-Out

CNR Construction can supply and fully fit your kitchen as part of the extension project. We work with your chosen kitchen supplier or our own trade contacts — either way, the kitchen fit-out is carried out by our in-house team as part of one fixed-price contract. No separate kitchen company arriving after we've left. One team, start to finish.

Groundworks & foundations
Structural steel beams
Full-width bifold doors
Roof skylights
Slate or paved patio
Kitchen island design
Kitchen supply & fit-out
Herringbone & wood flooring
Building regs sign-off
Get a Free Quote See Kitchen Extension
Service 03
03

Loft Conversions Wirral

A loft conversion is the most cost-effective way to add a bedroom, bathroom or office to your Wirral home without reducing your garden space. CNR Construction builds dormer loft conversions, hip-to-gable conversions and Velux rooflight conversions across Wirral and Chester — all with full building regulations sign-off, en-suite facilities if required, and a fixed price agreed before work begins.

Loft conversion Wirral — completed dormer with Velux rooflights on UK semi-detached
Loft conversion en-suite — CNR Construction bathroom and bedroom fit-out
Loft conversion en-suite Wirral — dark marble tiled bathroom with walk-in shower

Dormer Loft Conversions Wirral

A dormer loft conversion extends vertically from the existing roof slope, creating a box-shaped structure with upright walls and additional headroom. Dormers are the most common type of loft conversion in Wirral and can often be built under Permitted Development without planning permission. CNR builds dormer loft conversions to include bedrooms, en-suites, home offices and study rooms — all with full insulation, plastering, flooring and decoration as part of the fixed price.

Hip-to-Gable Loft Conversions Wirral

A hip-to-gable conversion rebuilds the sloped 'hipped' end of your roof into a vertical gable wall — significantly increasing the usable floor area in the loft. This type of conversion is particularly suited to semi-detached homes in Wirral and is often combined with a rear dormer to maximise the space created. Hip-to-gable conversions typically require planning permission and are one of the most transformative loft conversion types available.

Velux (Rooflight) Loft Conversions

A Velux or rooflight loft conversion is the simplest and most cost-effective type of loft conversion — the roof structure is kept intact and Velux-style windows are fitted to the existing slope. Velux conversions almost always fall under Permitted Development with no planning required. They suit properties where the existing loft already has adequate headroom. CNR builds Velux conversions to full habitable standard, including insulation, plasterboard, flooring and staircase.

En-Suite & Bathroom Additions

Adding an en-suite or full bathroom to a loft conversion is one of the most requested additions CNR builds. Our in-house plumbing team handles the full drainage, plumbing, tiling and sanitaryware fit-out as part of the loft conversion contract. No separate bathroom company. No waiting around. It's included in the fixed price alongside the conversion itself.

Dormer conversions
Hip-to-gable conversions
Velux rooflight conversions
En-suite & bathroom
Full insulation & plastering
Flooring & decoration
New staircase
Electrics & lighting
Building regs sign-off
Get a Free Quote
Service 04
04

Structural Work & Knock-Throughs

Removing walls, opening up ground floors and installing structural steel beams is one of the most common elements of the building work CNR carries out across Wirral — either as a standalone project or as part of a larger extension. Structural work requires experienced contractors who understand load paths, temporary support and the legal requirements around structural calculations. CNR manages the full process in-house.

Structural work Wirral — RSJ steel beams and acrow props during wall removal
Acrow props and RSJ steel beam installation — CNR Construction Wirral
Open plan kitchen diner — result of structural knock-through by CNR Construction

RSJ Steel Beam Installation

When walls are removed to open up a ground floor, the load above must be transferred to a structural steel beam — typically an RSJ (rolled steel joist). CNR supplies, sizes and installs RSJ steelwork in-house, working to engineer-approved structural calculations. The steel installation is managed as part of the wider knock-through or extension project — no separate structural contractor required.

Wall Knock-Throughs & Open-Plan Transformations

A wall knock-through transforms two cramped rooms into one light-filled open-plan space. This is one of the most impactful changes you can make to a Wirral home without extending — and CNR regularly combines knock-throughs with rear extensions to create fully open-plan kitchen-dining-living spaces. Building regulations approval is required for structural knock-throughs and is included in the CNR quote.

Structural calculations
RSJ steel beams
Temporary support systems
Load-bearing wall removal
Replastering & making good
Building regs sign-off
Get a Free Quote See Chester Project
Service 05
05

New Builds Wirral

CNR Construction builds new residential and commercial properties across Wirral from foundations to completion. New build projects are fully managed in-house — from groundworks, blockwork and structural frame through to insulation, first and second fix, fit-out and decorating. If you have a plot, planning permission and a brief, CNR can deliver the complete build on a fixed-price contract.

New build Wirral — completed residential new build at dusk with landscaped garden
New build exterior Wirral — red brick with large glazing and planted garden
New build Wirral — completed property with rear patio and garden
Full groundworks
Masonry & blockwork
Structural frame
Roofing
External cladding & render
Windows & doors
First & second fix electrics
Plumbing & heating
Full internal fit-out
Discuss Your New Build
Service 06
06

Kitchens & Bathrooms

CNR Construction supplies and installs kitchens and bathrooms as standalone projects and as part of wider extension or loft conversion builds. Our in-house team handles the full scope — tiling, plumbing, electrics, plastering and fit-out — without the need for separate contractors. Whether you're upgrading an existing kitchen as part of an extension or fitting out a new bathroom in a loft conversion, CNR delivers the full job on one fixed price.

Kitchen fit-out Wirral — dark shaker kitchen with island, herringbone tiles and pendant lights
Bathroom installation Wirral — dark marble wet room with walk-in shower and vessel sink
Kitchen installation Wirral — grey shaker kitchen with island and herringbone oak flooring
Kitchen supply & installation
Kitchen island fitting
Bathroom design & fit-out
En-suite installation
Full plumbing in-house
Wall & floor tiling
Electrical first & second fix
Underfloor heating
All flooring types
Get a Free Quote
Service 07
07

Groundwork & Masonry

Every extension CNR builds starts below ground — and every groundwork and masonry element is carried out by our own team. Strip foundations, drainage runs, brickwork, blockwork, stonework and paving are all delivered in-house. This is what keeps our projects on programme and allows us to guarantee a fixed price — we're not waiting on a groundwork subcontractor to show up before we can lay the first course of brickwork.

Groundwork and paving Wirral — CNR Construction slate patio and rear extension
Groundwork before and after Wirral — excavation and completed patio by CNR Construction
Underfloor heating installation Wirral — CNR Construction in-house groundwork
Strip & pad foundations
Drainage & soakaways
Brickwork & blockwork
Engineering brick
Natural stonework
Paving & patios
Retaining walls
Steps & walling
Repointing & repair
Get a Free Quote

Not sure which service
you need? We'll tell you.

Free site visit. We'll walk round your property, understand your brief, and give you honest advice on the most practical route — before you commit to anything.

07784 255380
Book a Free Visit
Common Questions

Questions about our services.

Everything Wirral homeowners regularly ask us before booking a site visit.

What type of extension is right for my Wirral home? +
It depends on your property layout, garden space and planning situation. Terraced and semi-detached homes across Wirral most commonly suit rear or side return extensions. Detached homes have more options. CNR will walk round your property on a free site visit and recommend the most practical route — we won't try to oversell you a bigger project than your property warrants.
How much does a loft conversion cost in Wirral? +
A Velux rooflight loft conversion in Wirral typically costs £25,000 to £40,000. A dormer loft conversion runs £40,000 to £65,000 depending on size and specification. Hip-to-gable conversions sit at the higher end. All CNR quotes are fixed — the price you see is the price you pay. We'll assess your loft on a free site visit and give you an accurate range before you commit.
Can you do structural knock-throughs on Victorian terraces? +
Yes — this is one of the most common projects we do across Wirral. Victorian and Edwardian terraces are very well-suited to ground-floor knock-throughs and rear extensions. CNR has extensive experience with period properties, including installing RSJ steel beams, working on narrow plots and managing party wall matters where required.
Do you supply and fit kitchens as part of an extension? +
Yes. CNR can supply and fully install your kitchen as part of the extension project. We work with your chosen kitchen supplier or our own trade contacts. Either way, the kitchen fit-out is carried out by our in-house team as part of one fixed-price contract — not handed off to a separate company after we've finished the building work.
Is groundwork included in your extension quotes? +
Always. Foundations, drainage and all groundwork are included in every CNR quote. We do not price extensions above ground and leave groundworks as a separate 'to be confirmed'. You receive a fixed price covering the entire project — from the first spade in the ground to the last coat of paint.
Do you need planning permission for a loft conversion in Wirral? +
Most loft conversions in Wirral fall under Permitted Development and don't require planning permission — provided the volume addition doesn't exceed 40m³ for terraced homes (50m³ for semi-detached and detached). Hip-to-gable conversions and properties in conservation areas typically do require planning. CNR confirms your planning position on the initial site visit.
Can you add a bathroom or en-suite to a loft conversion? +
Yes — adding an en-suite or full bathroom to a loft conversion is standard on most projects CNR builds. Our in-house plumbing team manages the full drainage, plumbing, tiling and sanitaryware fit-out as part of the loft conversion contract. Building regulations sign-off covers the full scope including the bathroom.
Do you work on older and period properties? +
Yes. Much of our work across Wirral involves Victorian, Edwardian and 1930s properties. CNR has extensive experience extending, converting and structurally altering period homes — including working within conservation area guidelines, managing lime mortar and traditional materials, and navigating the specific quirks that older properties present.